Attrition-mill.



1. s. SORENSEN.

ATTRITION MILL.

APPLICATION FILED IULYI6. I912. RENEWED MAR. 10.1915. LLHMI. Patented July 13, 1915.

2 SHEETS-SHEEI l- J. S. SORENSEN.

ATTRITION MILL. APPLICATION HLEDJULYI6. 1912. RENEWED MAR. I0, 1915. LMMM.

Patented July 13, 1915.

2 SHEETS-SHEET 2.

JOHN S. SORENS'EN, 0F MUNCY, PENNSYLVANIA, ASSIGNOR TO SPROUT, WALDRON & COMPANY, OF MUNCY, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

ATTRITION-MILL.

Patented July 113, 1915 Application filed July 16, 1912, Serial No. 709,673. Renewed March 10, 1915. Serial No. 13,501.

"0 all whom it m (17 concern:

Be it known that I, Join: S. SORENSEN,

a citizen of the United States, residing at Muncy, in the county of Lycoming and State of Pennsylvania,-l1ave invented certain new and useful Improvements in Attrition- Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to attrition mills and has for its object to dispense with the necessary adjustment of the head runner shaft for taking up wear, thereby reducing friction. simplifying the construction of the mill, lessening the cost of manufacture thereof, and saving the time heretofore required in operation to. stop the mill. and make the required adjustment.

Heretofore it has been the practice to employ a pair of seal-rings between the head runner and adjacent Wall of the casing J in which said runner 1s housed, for the purpose of preventing the entrance of material into said casing externally of the inlet passages in said runner. One of said seal-rings was secured to the casing and the other to the runner, and their 1'neetingfaces were disposed transversely to the axis of rotation. Said meeting faces were consequently subject to wear due to the rapi l. rotation of one against the other in the operation of the mill. In order to compensate for this wear on the seal-rings, the runner shaft was mounted in an adjustable bearing, whereby it could be moved axially toclose such space as had been worn between said seal-rings. In the present invention frictionally engaging seal-rings are dispensed with, eliminating the wear incident thereto. so that it is possible to mount said shaft in a fixed bearing. a

The invention will hereinafter be first fully described with reference to the ac companying drawings, wh'ich form a part of this specification. and then pointed out in the claims following the description.

In the drawings, Figure 1 is a central vertical longitudinal section of an attrition mill embodying this invention; Fig. 2 is a detail elevation of the flange carried by the head runner for closing the space between it and the casing; Fig. 3 is a central vertical section through said flange; Fig. 4c is a detail elevation of the guard ring which cooperates with said flange; Fig. 5 is a central vertical section of said ring; Fig. 6 is an enlarged detail section of the flange and guard ring, together with their supporting parts, the flange being detachable; and Fig. 7 is a similar section showing the flange formed integral with the runner.

The operating parts of the mill are supported upon a base 1 preferably having the delivery spout 2 for ground material formed integral therewith. A plurality of pedestals 3 are mounted on the base and support hearing shells 4 at their upper ends. The head runner shaft 5 is preferably journaled in two of said bearing shells, one arranged near its inner end and having the shaft passing through it, and the other arranged so as to inclose the outer end of said shaft. The bore of the end bearing shell is stepped to form an annular shoulder 6 against which :the outer race-ring 7 of an antifriction bearing is secured by means of a cover plate 8 which closes the inner open end of the bearing shell and is provided with an inwardly extending annularflange 9 contacting with said outer race-ring of the bearing and clamping the same against the shoulder 6. Said cover may be fastened to the bearing shell by means of bolts 10 or any other suitable means. The preferred form of anti-friction bearing, as illustrated. comprises a pair of concentric rings or races having annular grooves in their opposed faces and a plurality of balls or rollers 11 seated in said annular grooves. The outer end of the shaft 5 is stepped to form a shoulder 12, and around its reduced end portion is mounted the inner race-ring 13 of the anti-friction bearing. Said inner race-ring is clamped against the shoulder 12 by a nut 14 screwed upon the extremity of the shaft. It will be noted that by means of this end bearing the head runner shaft,

if desired, may be fixed against axial adjustment after the mill is set up.

The inner bearing shell 4 for the head runner shaft is closed by a cover plate 15 fitting around the shaft and arranged at the side. of the shell facing the end bearing. A thrust collar 16 is mounted around a diametrically enlarged portion 17 of the shaft and extends from the outer end of the hub 18 of the head runner 19 into this bearing shell. A nut 20, secured on the exvtremity' of said enlarged portion 17 of the shaft, clamps the inner race-ring of an antifriction bearing 21 against the end of the thrust collar. Said bearing 21 is similar to the one previously described.

The casing 22 for the runners is provided with an inlet or feed opening 23 surrounding the hub of the head runner and registering at its upper portion with the lower end of the feed chute 24. Inlet passages 25 through the head runner deliver the material to be ground from the feed chute to the space between the runners.

The head runner carries an axially projecting flange 26 which bridges the space between said runner and the adjacent wall of said casing and extends into the feed opening 23. This flange may be detachably mounted on the head runner, as illustrated in Figs. 1 and 6, or it may be made integral with said runner as shown in Fig. 7. When made separate, said flange is preferably constructed in two semi-circular parts for convenience in manufacture, as illustrated in Figs. 2 and 3.

In order to close the space between the outer annular surface of the flange 26 and the inner edge of the opening 23 in the easing, I provide a guard ring 27 attached to the casing and disposed edgewise to said outer surface of the flange. Said guard ring is preferably made of thin hard steel and is adapted to effectually exclude material from entering the casing around the outside of the flange without itself binding upon the latter so as to cause excessive wear on the same or impede the rotation of the runner. To this end, the guard ring is placed with its inner edge in juxtaposition to the axial flange but not actually in contact therewith. However, in order to compensate for any slight wear that may come upon the inner edges of said ring through long continued use. I make it in a plurality of sections, preferably as illustrated in Figs. 4 and 5-, and provide foradjusting each section radially toward the flange. To effect this adjustment, each section of the ring maybe screwed to the casing by bolts 28 engaging slots 29 which extend parallel to the direction of movement of said section. It will be observed that owing to the fact that the juxtaposed surfaces of the guard ring and flange are disposed parallel to the axis of the runner shaft, any slight wear which may oc ur between said ring and flange need not be compensated for by the axial adjustment of said shaft. The latter may consequently be mounted in fixed bearings, as described, without impairing the efiiciency of the mill.

The tail runner 30 is suitably mounted upon the tail runner shaft 31, which is supported by anti-friction bearings 32 within a pair of the bearing shells 4, substantially in the same manner as already described in connection with the head runner shaft. The details of the mountings of said tail runner shift need not be specifically described herein be use they do not form any part of the present invention. Both runner shafts may be driven by band pulleys 33 in the usual manner.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In an attrition mill, the combination with arunner shaft, of a casing having an inlet opening around the shaft, a runner on said shaft within the casing and provided with inlet passages registering with the opening in said casing, a continuous lateral flange on said runner arranged externally of the inlet passages therein and projecting into the inlet opening in the casing, and a guard ring on said casing adapted to be adjusted radially toward said flange for the purpose specified.

2. In an attrition mill, the combination with a runner shaft, of av casing having an inlet opening around the shaft, a runner on said shaft within the casing and provided with inlet passages registering with the opening in said casing, said runner spaced away from the wall of the casing in which said inlet opening is formed, a continuous lateral flange on said runner arranged externally of the inlet passages therein and projecting into the inlet opening in the easing, and a guard ring on said casing extending into juxtaposition to said flange and adapted to be adjusted radially toward said flange for'the purpose specified.

3. In an attrition mill, the combination with a runner shaft, of a casing having an inlet opening around the shaft, a runner on said shaft within the casing and provided with inlet passages ggistering with the opening in said casing, said runner spaced away from the wall of the casing in which said inlet opening is formed, a continuous flange on said runner arranged externally of the inlet passages therein and projecting axially into the opening in the casing, and a guard ring on said casing disposed edgewise to the outer surface of said flange and having its inner edge arranged in juxtaposition to said flange said guard-ring being adjustable radially toward said flange.

4. In an attrition mill, the combination with a runner shaft, of a casing having an inlet opening around the shaft, a runner-011 said shaft within the casing and provided with inlet passages registering with the opening in said casing, said runner spaced away from the wall of the casing in which said inlet opening is formed, a continuous flange on said runner arranged externally of the inlet passages therein and projecting axially into the opening in the casing, and a guard ring on said casing extending into iuxtap'osition tosaid fiange,-said guard ring being-madam aplurality offlse'ctionsv each 1 i-adjj tahle' "towardsaid flange for the pur- 15.;In :an attrition mill, the combination with a runner shaft of a casing having an inlet opening aroun the shaft, a runner on jsaidshaft within the casing and provided with inlet passages registering with the '10 openingin said casing, said runnerspaced ,away i fromtheiwall-of the casing in which said inlet opening" is formed," a continuous flange on said runner arranged externally of the inlet passages therein and projecting axially intothe opening in the casing, and a guard ring on. saidcasing extending into juxtaposition to said flange, said guard ring being made in a plurality of sections each adjustable toward said flange by means of bolts on the casing engaging slots in said ring section, the slots in each section extend-- ing parallel to its direction of movement.

In testimony whereof I afiix my signature 

